DE102022123572A1 - Control device and electric heating device comprising such - Google Patents

Abstract

The present invention relates to a control device (44) and electric heating device (2) comprising such. The control device (44) has a control housing (32) surrounding a circuit board (40), which has a partition (28) provided with a heat sink (46) and accommodates at least one circuit breaker (60) which is contacted with the circuit board (40) and which is via a hold-down device (52) is placed against the heat sink (46) in a heat-conducting manner. According to the present invention, the circuit breaker (60) and the hold-down device (52) are implemented in a preassembled assembly (42) which is connected to the heat sink (46).

Description

The present invention relates to a control device, in particular for an electric heating device with a PTC element as an additional heater in a motor vehicle.

Control devices, in particular for electric heating devices with a ceramic PTC element for heating motor vehicles, are sufficiently described in the prior art, for example in EP 1 872 986 A1 or EP 2 337 425 A1 . A control device in such an electric heating device usually has a control housing which surrounds the control components and is provided with plug-in connections for connecting control signals and/or the power current to be controlled. The examples described above as well as the electric heating device EP 3 334 242 A1 implement a concept in which the control device is provided integrally with the power section. The control device has at least one circuit breaker that emits power loss during operation. This is usually fed to the medium to be heated. Accordingly, the circuit breaker is not only provided with a heat sink that dissipates the power loss and accordingly counteracts overheating of the circuit breaker. Rather, the heat sink is thermally coupled to the fluid to be heated. For this purpose, the heat sink can be provided in a heating chamber which is separated from the receiving space of the control housing by a partition in which the part of the heat sink that rests on the circuit breaker is accommodated. Usually, a partition wall is provided between the receiving chamber of the control housing and the heating chamber, which delimits both the heating chamber and the receiving chamber of the control housing. This partition can itself form the heat sink or can be penetrated by a separate heat sink. The heat sink forms a cooling surface against which the circuit breaker rests in a heat-conducting manner. The control housing can also accommodate contact zones of PTC heating devices, which usually protrude into the heating chamber and include at least one PTC element. The interior of the control housing is also referred to as a connection chamber in the prior art, since the contact zones in this chamber are electrically connected.

The previously mentioned features also apply to the implementation of the control device according to the invention in an electric heating device with a ceramic PTC element as an additional heater.

Control devices in motor vehicle technology are subject to the conditions prevailing there. The control components within the control device are subjected to significant vibrations. It goes without saying that the control housing must be as tight as possible so that neither dust nor moisture can penetrate the control housing. However, the components installed do not just have to be designed to be vibration-proof. The aim is to create a design that provides the desired functionality with as few components as possible. The components should be easy to manufacture, scalable and insensitive to handling during production. The components must remain functional over the lifespan of the motor vehicle and despite the conditions mentioned above.

The present invention is particularly concerned with the problem of applying the circuit breaker in a heat-conducting manner under pretension against a heat sink. There has already been no lack of suggestions for this in the prior art.

For example, revealed EP 1 395 098 A1 a control device of an electrical heating device with a PTC element, in which a heat sink lies directly against a circuit breaker mounted on a circuit board in a heat-conducting manner and protrudes from the circuit board on the side opposite the circuit breaker. The heat sink and the circuit breaker are surrounded by a C-shaped spring claw, which keeps the two components biased against each other.

With that out US 5,812,375 Known construction principle, the circuit breaker is placed against the surface of a heat sink with the interposition of an electrically insulating film, which engages in a receiving opening of a circuit board, to the conductor tracks of which the circuit breaker is electrically connected. On the side opposite the heat sink, an elastomeric component with a U-shaped cross section rests against the circuit breaker and is supported on a housing cover of the control housing. For this purpose, the housing cover has a projection which is encompassed by the prestressing means which is U-shaped in cross section.

DE 100 34 572 A1 discloses a control device for an additional holder of a motor vehicle, in which an at least partially elastic pressing projection protrudes from a housing cover and is provided opposite a heat sink which is coupled to the heating chamber in a heat-conducting manner. A circuit breaker is arranged between the pressing projection and the heat sink, which can be operated with the interposition of an optionally elastic, heat-conducting but electrically insulating film rests against the heat sink.

For vibration-free support of the circuit board on a housing base of a control housing, suggests DE 196 00 619 A1 a biasing means acting on the circuit breaker in the form of an elastomeric strip, which presses the circuit breaker and the printed circuit board therebetween against an outer edge of the control housing.

The solutions known from the prior art still leave something to be desired. From DE 196 00 619A1 previously known solution is not always applicable in practice, since this solution requires a raised edge area against which the circuit board rests. The edge area of the control device is not always below the edge area of the control housing in an electric heating device with a structural unit consisting of a control section and a power section.

Furthermore, sometimes a certain height must be bridged between the circuit breaker and a housing cover so that the DE 196 00 619A1 Known elastomer strips are unsuitable for the system of the circuit breaker under tension against a heat sink.

In view of this, the proposal goes back to the present applicant EP 2 466 989 A1 a supporting structure, which is provided between the housing cover and a circuit board and supports an elastic hold-down device made of a compressive plastic, which protrudes through the circuit board and rests against a circuit breaker in order to apply this under pretension against the cooling surface of a heat sink, which is connected to the heating chamber in a heat-conducting manner is.

The present invention aims to provide a control device that allows good heat transfer between the circuit breaker and the cooling surface and can be manufactured easily and inexpensively.

To solve the above problem, the present invention proposes a control device having the feature of claim 1.

According to the present invention, the circuit breaker is implemented together with the hold-down device in a preassembled assembly that is connected to the heat sink. The hold-down device as such can form receptacles for the one or more circuit breakers. The circuit breakers are held in a predetermined arrangement at least in a direction transverse to the circuit board.

The assembly allows the circuit breaker(s) to be handled uniformly and mounted in the control device. This enables cost-effective production to be achieved. This is particularly true if several circuit breakers are installed in the control device and are included in the assembly.

With a view to achieving the best possible heat extraction of the heat generated by the circuit breakers, the control device preferably has at least one spring device. Usually, a single spring device is assigned to a corresponding circuit breaker, so that the circuit breaker is kept biased by this spring device. The biasing occurs in such a way that the circuit breaker is biased against the cooling surface. In this preferred development, the spring device is included in the assembly. By handling and assembling the assembly, the circuit breaker can be placed under tension against the cooling surface.

The spring device is preferably held on the hold-down device via at least one positive connection acting transversely to the direction of force action of its spring force. For this purpose, the hold-down device can have a pin which extends essentially at right angles to the main extent of the circuit board and which is positively gripped by the spring device. Any other type of positive connection is conceivable. However, a pin connection has proven to be advantageous if the spring device is made of a plastic, in particular of a silicone, and is implemented as a hollow body, so that the pin can engage in the hollow body and hold it in a form-fitting manner. A spring device made of silicone is also suitable because of the good heat resistance of the plastic. Furthermore, a silicone spring provides good elastic and electrically insulating support for the circuit breaker.

According to a preferred development of the present invention, the circuit breaker is held movably in the assembly while changing a preload caused by the spring device. The assembly has a support that prevents the circuit breaker from being pushed out of the assembly due to the acting spring force. On the other hand, the circuit breaker can be moved away from the support while increasing the spring force of the spring device. The design is usually chosen so that the circuit breaker lies flat against the cooling surface even as the compression of the spring increases. The circuit breaker remains within the assembly, but can be moved within certain limits within the assembly of a prestressing system, avoid the cooling surface. This means that the preload force can act unhindered on the circuit breaker.

According to a preferred development of the present invention, the assembly has a positioning frame. This forms at least one receptacle for a circuit breaker. In the receptacle, the circuit breaker is usually held in a form-fitting manner at least in a direction transverse to the plane of the circuit board. For the reasons mentioned above, the circuit breaker is regularly movable within the positioning frame transversely to this direction of extension of the circuit board.

With a view to cost-effective production, the positioning frame and the hold-down device are usually made of plastic. Both components are preferably clipped together, including the at least one circuit breaker and - if available - the spring device. For assembly, the circuit breaker is accommodated in the positioning frame. The positioning frame equipped with the circuit breaker(s) is then connected to the hold-down device by clipping. This can previously be provided with the spring device assigned to the circuit breaker. The connection between the positioning frame and the hold-down device can result in a substantially rigid connection between the two components. The latching connection produced by clipping can just as well be such that the positioning frame can also be moved in a direction perpendicular to the cooling surface, which can promote the flat contact of the circuit breaker against the cooling surface.

The positioning frame usually has an opening surrounding the cooling surface. This is dimensioned so that the cooling surface can usually engage in the opening and can be contacted in a heat-conducting manner with the circuit breaker. The opening is limited by a support for the circuit breaker. The circuit breaker is placed on this support during assembly. This support supports the circuit breaker when the spring device acts against the circuit breaker after the positioning frame and the hold-down device have been joined. During assembly, the support represents a counter surface against which the circuit breaker is pressed due to the spring device.

According to a further preferred embodiment of the present invention, the positioning frame has a window through which at least one contact pin of the circuit breaker protrudes. This window is limited on the top by the hold-down device. Before joining the hold-down device and the positioning frame, the circuit breaker can be inserted into the positioning frame, with the contact pin or pins being inserted into the window from above through the opening in the positioning frame. This simplifies the fitting of the positioning frame with the circuit breaker(s).

The control device can have positive locking segments on the heat sink side, which interact with positive locking counter segments of the assembly to position the assembly transversely to the plane of the circuit board. These positive locking counter segments are preferably implemented on the hold-down device. The interaction of the form-fitting segments with the form-fitting counter-segments leads to an appropriate pre-positioning of the assembly relative to the heat sink during assembly, so that the circuit breaker is securely placed against the cooling surface.

A power switch according to the present invention can be formed, for example, by a MOSFET or an IGBT. The contact against the cooling surface can be done with the interposition of an electrically insulating film, for example a polyimide film, in order to electrically decouple the cooling surface from the circuit breaker, but at the same time enable good heat conduction from the circuit breaker to the cooling surface. Alternatively, a ceramic plate can also be provided between the cooling surface and the circuit breaker.

With a view to easily applying the preload force for preloading the circuit breaker against the cooling surface, the assembly is usually connected to the connection housing in a direction perpendicular to the extent of the circuit board. This is preferably done by screws, which can be held within the form-fitting segments. Tightening the screws also causes or increases the pretensioning force of the spring device, but in any case the circuit breaker(s) is placed under pretension against the heat sink.

According to its secondary aspect, the present invention proposes an electric heating device with the features of claim 10. This electric heater is already out EP 2 466 989 A1 known way a partition between the control housing and a heater housing. This partition usually forms both a termination of a heating chamber formed by the heater housing and a termination of the control housing. At least one PTC heating device protrudes from the partition wall as a heating rib into the heater housing. The PTC heating unit Direction can be accommodated in the partition wall with plug contacts or positioned and fixed relative to it in some other way. The PTC heating device has at least one PTC element and, to power it, conductor tracks that are electrically conductively connected to it with different polarities. The conductor tracks are electrically connected in the control housing. To do this, they protrude into the control housing and can have plug-in contact with the circuit board, which also carries the circuit breaker, or another circuit board that is intended for grouping heating circuits comprising several PTC heating devices. A heat sink is exposed in the heating chamber, which is connected in a heat-conducting manner to a cooling surface provided in the connection chamber. The circuit breaker rests against this cooling surface, so that the power loss emitted by the circuit breaker can also be used to heat the fluid to be heated in the heating device. This fluid can be a liquid fluid or a gaseous fluid, in particular air.

This aforementioned electric heater has a control device according to any one of the preceding claims.

• 1 eine perspektivische Explosionszeichnung eines Ausführungsbeispiels einer elektrischen Heizvorrichtung;
• 2 eine Längsschnittansicht einer PTC-Heizeinrichtung der Heizvorrichtung nach 1;
• 3 eine perspektivische Seitenansicht einer Baugruppe über der Leiterplatte und dem Kühlkörper;
• 4 eine Längsschnittansicht einer Baugruppe nach der Montage;
• 5 eine Querschnittansicht der Baugruppe nach 3;
• 6 eine perspektivische Seitenansicht eines Ausrichtelements vor der Montage;
• 7 eine perspektivische Seitenansicht eines Ausrichtelements nach der Montage;
• 8 ein vergrößertes Detail von 5;
• 9 eine Draufsicht zu der Darstellung nach 8.

Further details and advantages of the present invention emerge from the following description in conjunction with the drawing. In this shows:

• 1 an exploded perspective drawing of an embodiment of an electric heater;
• 2 a longitudinal sectional view of a PTC heating device according to the heating device 1 ;
• 3 a perspective side view of an assembly above the circuit board and heat sink;
• 4 a longitudinal sectional view of an assembly after assembly;
• 5 a cross-sectional view of the assembly 3 ;
• 6 a perspective side view of an alignment element before assembly;
• 7 a perspective side view of an alignment element after assembly;
• 8th an enlarged detail of 5 ;
• 9 a top view of the representation 8th .

The 1 shows an exemplary embodiment of an electric heating device 2 with a multi-part heater housing 3, which includes a lower housing part 4 made of plastic and an upper housing part 6 made in one piece from metal by die-casting.

The lower housing part 4 is trough-shaped, encloses a heating chamber 8 and forms openings to inlet and outlet connections 10, which communicate with the heating chamber 8. These inlet and outlet ports 10 are formed in one piece with the lower housing part 4 by means of injection molding. Several PTC heating devices 12 are shown between the upper housing part 6 and the lower housing part 4.

How 2 These PTC heating devices 12 each have at least one PTC element 14, on which contact plates 16 rest, which form contact tongues 18, which protrude beyond a metallic housing 20. The PTC element 14 is accommodated in a frame 22 and between the contact plates 16. An insulating layer 24 is provided between the metallic housing 20 and the contact plates 16.

The PTC heating devices 12 are held with plug contacts in receptacles 26 provided for this purpose in a partition 28 of the upper housing part 6. Details of this design can be found in the document provided by the applicant EP 3 334 242 A1 described.

On the side of the partition 28 opposite the PTC heating devices 12, a connection chamber 30 is formed, which is surrounded by a control housing 32 that has a control housing cover 34, which is connected to the upper housing part 6 in a sealed manner via a seal 36. In the connection chamber 30 there is a first circuit board 38, which accommodates the contact tongues 18 and groups the individual PTC heating devices 12 into heating circuits.

A second printed circuit board, marked with reference number 40, is provided in the control housing 32 and is equipped with electronic components, not shown in detail. Reference numeral 42 denotes one in the following 3 ff assembly shown in more detail, which is part of the in 1 Control device marked with reference numeral 44.

The 3 shows, in addition to the assembly 42, schematically the partition 28, from which a heat sink 46 projects in the direction of the connection chamber 30. This heat sink 46 forms a flat cooling surface 48. The heat sinks 46 are extended into the heating chamber 8 and form heat sinks 49 there. In extension to the cooling surface 48 and adjacent to it, form-fitting segments 50 on the heat sink side are also formed by the upper housing part 6, which form a slightly conical shape jumps also protrude from the partition wall 28 shown schematically here.

The assembly 42 includes a hold-down device 52, which is designed as an elongated plastic component and forms form-fitting counter-segments 54 at its respective ends, which can interact in a form-fitting manner with the form-fitting segments 50 in order to position the hold-down device 52 relative to the upper housing part 6 and thus the control housing 32.

Reference number 56 denotes a positioning frame which forms several receptacles 58 for circuit breakers 60. Each circuit breaker 60 has three contact pins marked with reference number 62, which are bent approximately in the middle by 90 degrees and have a contact-side section 64 which extends essentially at right angles to the main extent of the circuit board 40.

How 4 conveyed, the hold-down device 52 has lateral locking pawls 66 which grip the underside of the positioning frame 56. The side of the assembly 42 facing the circuit board 40 is referred to as the underside. Corresponding to these locking pawls 66, the positioning frame 56 has ramp surfaces 68 on its upper side, on which the locking pawls 66 slide off during assembly when the hold-down device 52 is clipped to the positioning frame 56.

As the 4 and 5 can be seen, the recordings 58 are essentially adapted to the dimensions of the circuit breakers 60. On the underside, the positioning frame 56 forms an opening 70 in which the circuit breakers 60 are each exposed. The opening 70 is delimited by a web 72 which projects towards the opening 70 and forms a support 74 for the circuit breaker 60. The 4 and 5 also show a spring device in the form of a silicone spring 76 designed as a hollow body. In the present case, the silicone spring 76 is designed as a short piece of hose and is plugged onto a pin 78 formed by the hold-down device 52, which results in a positive connection between the silicone spring 76 and the hold-down device 52, through which the silicone spring 76 is fixed at right angles to its spring force relative to the hold-down device 52 is.

As part of the assembly, the individual components are first provided. The silicone spring 76 can then be attached to the respective pins 78 in order to provide the hold-down device 52 with the spring devices. In parallel, the individual circuit breakers 60 are inserted into the receptacles 58 assigned to them. For this purpose, the positioning frame 56 has a reference number 80 in 5 marked window, which allows the circuit breaker 60 to be lowered into the receptacle 58 without affecting the alignment of the contact pins 62. After assembling the respective circuit breakers 60, they rest on the support 74. The hold-down device 52 is then brought closer to the positioning frame 56. The locking pawls 66 slide past the ramp surfaces 68. The locking pawls 66 are spread and spring back on the underside of the positioning frame 56, whereby a positive connection between the hold-down device 52 and the positioning frame 56 is formed. As part of this joining movement, the silicone springs 76 are received between the hold-down device 52 and the circuit breakers 60 and, if necessary, slightly prestressed. The assembly 42 produced in this way is then mounted in the control housing 32. For this purpose, the assembly 42 is brought closer to the upper housing part 6. The heat sink 46 passes through the opening 70 and rests against the circuit breaker 60 in a heat-conducting manner. An insulating layer, for example in the form of a polyimide film or a ceramic layer, has usually been previously introduced between the cooling surface 48 and the power switches 60 in order to avoid direct electrical contact between the power switch 60 and the heat sink 46. The joining movement may be guided by the interaction of the form-fitting segments 50 with the form-fitting counter-segments 54. This can result in a prepositioning of the assembly 42 relative to the heat sink 46.

Screws marked with reference number 82 are then screwed into the upper housing part 6. These cause the hold-down device 52 to be fixed on the upper housing part 6 and thus a compression of the silicone springs 76 and accordingly a system of the circuit breakers 60 under pretension. As can be seen, the opening is dimensioned accordingly so that the heat sink 46 can easily dip into the positioning frame 56. The individual receptacles 58 in the longitudinal direction of the hold-down device 52 delimiting cross bars 84 of the positioning frame 56, which separate the respective receptacles 58 from one another, allow a corresponding movement. These cross bars 84 are opposite in 5 The height of the longitudinal bars 86 shown is reduced.

The 6 to 9 clarify an in 5 Alignment element marked with reference number 90 made of a plastic. This serves to facilitate the introduction of the contact-side section 46 of the contact pin into the circuit board 40. The alignment element 90 has a passage 92 which is aligned with a slot 94 for the respective contact pin 62 within the circuit board 40. The slot 94 is electrically contacted with at least one conductor track of the circuit board 40 by a connection Piece 96 created, the details of which are in EP 2 236 330 A1 described and which in the 6 and 8th is shown. This connection piece 96 is basically flat on the top of the circuit board 40. Only upwardly bent radii 98 of retaining webs, which engage in holes in the circuit board 40, protrude slightly beyond the otherwise flat surface of the connecting pieces 96.

Like this in particular 8th and 9 As can be seen, the alignment element 90 has an opening 100 around the passage 92 on the side facing away from the circuit board 40, which is significantly wider than the dimensions of the passage 92. This opening 100 merges into the passage 92 without a step via inwardly inclined ramp surfaces 102. The alignment element 90 is mounted on the circuit board 40 so that the passage 92 is exactly aligned with the slot 94 within the circuit board 40. For this purpose, the alignment element 90 has positioning pins 104, which pass through a positioning hole 106 within the circuit board 40 and protrude beyond the underside of the circuit board 40. The positioning pins 104 extend from a projection which forms a contact surface 108 which is provided in a ring around the positioning pin 104. The alignment element 90 rests against the circuit board 40 via the contact surfaces 108. Like that 6 and 7 As can be seen, two positioning pins 104 and corresponding positioning holes are provided for each alignment element 90. This interaction already creates elements of a positive connection, through which the alignment element 90 is held in a form-fitting manner on the circuit board 40 transversely to the circuit board 40 and is fastened in this sense.

Like this in particular 6 , 7 and 8th can be seen, the alignment element 90 also has a locking leg 110, which forms a locking surface 112 resting against the underside of the circuit board 40. This locking leg 110 also clips against the circuit board 40. The locking leg 110 is connected by two connecting webs 114, which rest against the end face of the circuit board 84 at a certain transverse distance. Due to this configuration, the edge of the circuit board is surrounded by the alignment element 90.

How 5 clarified, the free ends of the positioning pins 104 rest against the partition 28. As a result, the alignment element 90 is supported locally in the area of the passage 92, whereby the circuit board 40 is mechanically relieved when the contact pins 62 are inserted.

How 6 As can be seen, the alignment element 90 shown there has several passages 92 with corresponding openings 100 and ramp surfaces 102. The comparison of this representation with 3 conveys that an individual alignment element 90 is provided for each circuit breaker 60. The number of passages 92 per alignment element 90 corresponds to the number of contact pins 62 of the circuit breaker 60. The 3 provides four alignment elements 90 connected in series next to each other to the circuit board 40.

As part of the assembly of the assembly 42, the individual contact pins 62 with their contact-side sections 64 are aligned with the slots 90 via the respective ramp surfaces 102 of the corresponding alignment elements 90. Any misalignment is usually compensated for by the elasticity of the contact pins 62.

Reference symbol list

2

Heating device

3

Heater housing

4

Lower housing part

6

Upper housing part

8th

Heating chamber

10

Inlet and outlet ports

12

PTC heater

14

PTC element

16

Contact plate

18

contact tongue

20

Housing

22

Frame

24

Insulating layer

26

Recordings

28

partition wall

30

Connection chamber

32

Control housing

34

Timing case cover

36

poetry

38

first circuit board

40

second circuit board

42

module

44

Control device

46

Heat sink

48

cooling surface

49

heat sink

50

Positive locking segments

52

Hold-down device

54

Positive locking counter segments

56

Positioning frame

58

Recording

60

Circuit breaker

62

Contact pin

64

contact side section

66

Latch

68

Ramp area

70

opening

72

web

74

edition

76

Silicone spring

78

Cones

80

Window

82

screws

84

Cross bars

86

Longitudinal spars

90

Alignment element

92

passage

94

slot

96

Connector

98

radii

100

widened opening

102

Ramp area

104

Positioning pins

106

Positioning hole

108

investment area

110

locking leg

112

Locking surface

114

connecting bridges

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1872986 A1 [0002]
• EP 2337425 A1 [0002]
• EP 3334242 A1 [0002, 0033]
• EP 1395098 A1 [0006]
• US 5812375 [0007]
• DE 10034572 A1 [0008]
• DE 19600619 A1 [0009, 0010, 0011]
• EP 2466989 A1 [0012, 0027]
• EP 2236330 A1 [0043]

Claims (10)

Control device (44), in particular an electric heating device (2) with a control housing (32) surrounding a circuit board (40), which has a partition (28) provided with a heat sink (46) and at least one circuit breaker contacted with the circuit board (40). (60), which is placed in a heat-conducting manner against the heat sink (46) via a hold-down device (52), characterized in that the circuit breaker (60) and the hold-down device (52) are implemented in a pre-assembled assembly (42) which is connected to the Heat sink (46) is connected. control device Claim 1 , characterized in that the assembly (42) has a spring device (76) which is provided between the hold-down device (52) and the circuit breaker (60) and through which the circuit breaker (60) is biased against the heat sink (46). . control device Claim 2 , characterized in that the spring device (76) is held on the hold-down device (52) via a positive connection that acts at least transversely to the direction of action of its spring force. control device Claim 2 or 3 , characterized in that the spring device is formed by a silicone component (76), in particular by a silicone hollow body. Control device according to one of the Claims 2 until 4 , characterized in that the circuit breaker (60) is held movably in the assembly (42) by changing a preload caused by the spring device (76). Control device according to one of the preceding claims, characterized in that the assembly (42) has a positioning frame (56) which forms at least one receptacle (58) for each circuit breaker (60). Control device according to one of the preceding claims, characterized in that the positioning frame (56) and the hold-down device (52) are clipped together, including the circuit breaker (60) and the spring device (76). Control device according to one of the Claims 6 or 7 , characterized in that the positioning frame (56) has an opening (70) surrounding the heat sink (46), which is delimited by a support (74) for the circuit breaker (60). Control device according to one of the Claims 6 until 9 , characterized in that the positioning frame (56) forms a window (80) through which at least one contact pin (62) of the circuit breaker (60) projects, which is delimited on the top side by the hold-down device (52). Electric heating device (2) with a control device (44) according to one of Claims 1 until 9 , wherein the partition (28) is provided between the control housing (32) and a heater housing (3) and at least one PTC heating device (12) protrudes from the partition (28) as a heating rib into the heater housing (3), the PTC Heating device (12) has at least one PTC element (14) and, for energizing the PTC element (14) with different polarity, electrically conductively connected contact tongues (18), which are electrically connected in the control housing (32), in the heating chamber (8) has a heat sink (49) exposed to the heat sink (46).

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